1 /*
2 * Copyright (C) 2019 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15 package com.google.common.util.concurrent;
16
17 import com.google.common.annotations.GwtIncompatible;
18 import java.time.Duration;
19
20 /** This class is for {@code com.google.common.util.concurrent} use only! */
21 @GwtIncompatible // java.time.Duration
22 @ElementTypesAreNonnullByDefault
23 final class Internal {
24
25 /**
26 * Returns the number of nanoseconds of the given duration without throwing or overflowing.
27 *
28 * <p>Instead of throwing {@link ArithmeticException}, this method silently saturates to either
29 * {@link Long#MAX_VALUE} or {@link Long#MIN_VALUE}. This behavior can be useful when decomposing
30 * a duration in order to call a legacy API which requires a {@code long, TimeUnit} pair.
31 */
32 static long toNanosSaturated(Duration duration) {
33 // Using a try/catch seems lazy, but the catch block will rarely get invoked (except for
34 // durations longer than approximately +/- 292 years).
35 try {
36 return duration.toNanos();
37 } catch (ArithmeticException tooBig) {
38 return duration.isNegative() ? Long.MIN_VALUE : Long.MAX_VALUE;
39 }
40 }
41
42 private Internal() {}
43 }